ssb: Make the GPIO API reentrancy safe.

SVN-Revision: 10496

2 files changed, 251 insertions, 28 deletions

diff --git a/target/linux/brcm47xx/files/include/asm-mips/mach-bcm947xx/gpio.h b/target/linux/brcm47xx/files/include/asm-mips/mach-bcm947xx/gpio.h
index 499df4ef18..4a897d1ea4 100644
--- a/target/linux/brcm47xx/files/include/asm-mips/mach-bcm947xx/gpio.h
+++ b/target/linux/brcm47xx/files/include/asm-mips/mach-bcm947xx/gpio.h
@@ -1,9 +1,7 @@
 #ifndef __BCM947XX_GPIO_H
 #define __BCM947XX_GPIO_H
 
-#include <linux/ssb/ssb.h>
-#include <linux/ssb/ssb_driver_chipcommon.h>
-#include <linux/ssb/ssb_driver_extif.h>
+#include <linux/ssb/ssb_embedded.h>
 
 extern struct ssb_bus ssb;
 
@@ -18,24 +16,13 @@ static inline void gpio_free(unsigned gpio)
 
 static inline int gpio_direction_input(unsigned gpio)
 {
-	if (ssb.chipco.dev)
-		ssb_chipco_gpio_outen(&ssb.chipco, 1 << gpio, 0);
-	else if (ssb.extif.dev)
-		ssb_extif_gpio_outen(&ssb.extif, 1 << gpio, 0);
-	else
-		return -EINVAL;
+	ssb_gpio_outen(&ssb, 1 << gpio, 0);
 	return 0;
 }
 
 static inline int gpio_direction_output(unsigned gpio, int value)
 {
-	if (ssb.chipco.dev)
-		ssb_chipco_gpio_outen(&ssb.chipco, 1 << gpio, value << gpio);
-	else if (ssb.extif.dev)
-		ssb_extif_gpio_outen(&ssb.extif, 1 << gpio, value << gpio);
-	else
-		return -EINVAL;
-
+	ssb_gpio_outen(&ssb, 1 << gpio, value << gpio);
 	return 0;
 }
 
@@ -43,7 +30,7 @@ static inline int gpio_direction_output(unsigned gpio, int value)
 static inline int gpio_to_irq(unsigned gpio)
 {
 	struct ssb_device *dev;
-	
+
 	dev = ssb.chipco.dev;
 	if (!dev)
 		dev = ssb.extif.dev;
@@ -61,21 +48,12 @@ static inline int irq_to_gpio(unsigned gpio)
 
 static inline int gpio_get_value(unsigned gpio)
 {
-	if (ssb.chipco.dev)
-		return ssb_chipco_gpio_in(&ssb.chipco, 1 << gpio) ? 1 : 0;
-	else if (ssb.extif.dev)
-		return ssb_extif_gpio_in(&ssb.extif, 1 << gpio) ? 1 : 0;
-	else
-		return 0;
+	return !!ssb_gpio_in(&ssb, 1 << gpio);
 }
 
 static inline int gpio_set_value(unsigned gpio, int value)
 {
-	if (ssb.chipco.dev)
-		ssb_chipco_gpio_out(&ssb.chipco, 1 << gpio, (value ? 1 << gpio : 0));
-	else if (ssb.extif.dev)
-		ssb_extif_gpio_out(&ssb.extif, 1 << gpio, (value ? 1 << gpio : 0));
-	
+	ssb_gpio_out(&ssb, 1 << gpio, (value ? 1 << gpio : 0));
 	return 0;
 }
 
diff --git a/target/linux/brcm47xx/patches-2.6.23/621-ssb-common-gpio-api.patch b/target/linux/brcm47xx/patches-2.6.23/621-ssb-common-gpio-api.patch
new file mode 100644
index 0000000000..d1debcfe3a
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.23/621-ssb-common-gpio-api.patch
@@ -0,0 +1,245 @@
+Index: linux-2.6.23.16/drivers/ssb/driver_chipcommon.c
+===================================================================
+--- linux-2.6.23.16.orig/drivers/ssb/driver_chipcommon.c	2008-02-19 15:50:42.000000000 +0100
++++ linux-2.6.23.16/drivers/ssb/driver_chipcommon.c	2008-02-19 15:50:44.000000000 +0100
+@@ -361,37 +361,31 @@ u32 ssb_chipco_gpio_in(struct ssb_chipco
+ {
+ 	return chipco_read32(cc, SSB_CHIPCO_GPIOIN) & mask;
+ }
+-EXPORT_SYMBOL(ssb_chipco_gpio_in);
+ 
+ u32 ssb_chipco_gpio_out(struct ssb_chipcommon *cc, u32 mask, u32 value)
+ {
+ 	return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUT, mask, value);
+ }
+-EXPORT_SYMBOL(ssb_chipco_gpio_out);
+ 
+ u32 ssb_chipco_gpio_outen(struct ssb_chipcommon *cc, u32 mask, u32 value)
+ {
+ 	return chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUTEN, mask, value);
+ }
+-EXPORT_SYMBOL(ssb_chipco_gpio_outen);
+ 
+ u32 ssb_chipco_gpio_control(struct ssb_chipcommon *cc, u32 mask, u32 value)
+ {
+ 	return chipco_write32_masked(cc, SSB_CHIPCO_GPIOCTL, mask, value);
+ }
+-EXPORT_SYMBOL(ssb_chipco_gpio_control);
+ 
+ u32 ssb_chipco_gpio_intmask(struct ssb_chipcommon *cc, u32 mask, u32 value)
+ {
+ 	return chipco_write32_masked(cc, SSB_CHIPCO_GPIOIRQ, mask, value);
+ }
+-EXPORT_SYMBOL(ssb_chipco_gpio_intmask);
+ 
+ u32 ssb_chipco_gpio_polarity(struct ssb_chipcommon *cc, u32 mask, u32 value)
+ {
+ 	return chipco_write32_masked(cc, SSB_CHIPCO_GPIOPOL, mask, value);
+ }
+-EXPORT_SYMBOL(ssb_chipco_gpio_polarity);
+ 
+ #ifdef CONFIG_SSB_SERIAL
+ int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
+Index: linux-2.6.23.16/drivers/ssb/driver_extif.c
+===================================================================
+--- linux-2.6.23.16.orig/drivers/ssb/driver_extif.c	2008-02-19 15:50:42.000000000 +0100
++++ linux-2.6.23.16/drivers/ssb/driver_extif.c	2008-02-19 15:50:44.000000000 +0100
+@@ -122,30 +122,25 @@ u32 ssb_extif_gpio_in(struct ssb_extif *
+ {
+ 	return extif_read32(extif, SSB_EXTIF_GPIO_IN) & mask;
+ }
+-EXPORT_SYMBOL(ssb_extif_gpio_in);
+ 
+ u32 ssb_extif_gpio_out(struct ssb_extif *extif, u32 mask, u32 value)
+ {
+ 	return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUT(0),
+ 				   mask, value);
+ }
+-EXPORT_SYMBOL(ssb_extif_gpio_out);
+ 
+ u32 ssb_extif_gpio_outen(struct ssb_extif *extif, u32 mask, u32 value)
+ {
+ 	return extif_write32_masked(extif, SSB_EXTIF_GPIO_OUTEN(0),
+ 				   mask, value);
+ }
+-EXPORT_SYMBOL(ssb_extif_gpio_outen);
+ 
+ u32 ssb_extif_gpio_polarity(struct ssb_extif *extif, u32 mask, u32 value)
+ {
+ 	return extif_write32_masked(extif, SSB_EXTIF_GPIO_INTPOL, mask, value);
+ }
+-EXPORT_SYMBOL(ssb_extif_gpio_polarity);
+ 
+ u32 ssb_extif_gpio_intmask(struct ssb_extif *extif, u32 mask, u32 value)
+ {
+ 	return extif_write32_masked(extif, SSB_EXTIF_GPIO_INTMASK, mask, value);
+ }
+-EXPORT_SYMBOL(ssb_extif_gpio_intmask);
+Index: linux-2.6.23.16/drivers/ssb/embedded.c
+===================================================================
+--- linux-2.6.23.16.orig/drivers/ssb/embedded.c	2008-02-19 15:50:42.000000000 +0100
++++ linux-2.6.23.16/drivers/ssb/embedded.c	2008-02-19 15:51:01.000000000 +0100
+@@ -11,6 +11,8 @@
+ #include <linux/ssb/ssb.h>
+ #include <linux/ssb/ssb_embedded.h>
+ 
++#include "ssb_private.h"
++
+ 
+ int ssb_watchdog_timer_set(struct ssb_bus *bus, u32 ticks)
+ {
+@@ -24,3 +26,107 @@ int ssb_watchdog_timer_set(struct ssb_bu
+ 	}
+ 	return -ENODEV;
+ }
++
++u32 ssb_gpio_in(struct ssb_bus *bus, u32 mask)
++{
++	unsigned long flags;
++	u32 res = 0;
++
++	spin_lock_irqsave(&bus->gpio_lock, flags);
++	if (ssb_chipco_available(&bus->chipco))
++		res = ssb_chipco_gpio_in(&bus->chipco, mask);
++	else if (ssb_extif_available(&bus->extif))
++		res = ssb_extif_gpio_in(&bus->extif, mask);
++	else
++		SSB_WARN_ON(1);
++	spin_unlock_irqrestore(&bus->gpio_lock, flags);
++
++	return res;
++}
++EXPORT_SYMBOL(ssb_gpio_in);
++
++u32 ssb_gpio_out(struct ssb_bus *bus, u32 mask, u32 value)
++{
++	unsigned long flags;
++	u32 res = 0;
++
++	spin_lock_irqsave(&bus->gpio_lock, flags);
++	if (ssb_chipco_available(&bus->chipco))
++		res = ssb_chipco_gpio_out(&bus->chipco, mask, value);
++	else if (ssb_extif_available(&bus->extif))
++		res = ssb_extif_gpio_out(&bus->extif, mask, value);
++	else
++		SSB_WARN_ON(1);
++	spin_unlock_irqrestore(&bus->gpio_lock, flags);
++
++	return res;
++}
++EXPORT_SYMBOL(ssb_gpio_out);
++
++u32 ssb_gpio_outen(struct ssb_bus *bus, u32 mask, u32 value)
++{
++	unsigned long flags;
++	u32 res = 0;
++
++	spin_lock_irqsave(&bus->gpio_lock, flags);
++	if (ssb_chipco_available(&bus->chipco))
++		res = ssb_chipco_gpio_outen(&bus->chipco, mask, value);
++	else if (ssb_extif_available(&bus->extif))
++		res = ssb_extif_gpio_outen(&bus->extif, mask, value);
++	else
++		SSB_WARN_ON(1);
++	spin_unlock_irqrestore(&bus->gpio_lock, flags);
++
++	return res;
++}
++EXPORT_SYMBOL(ssb_gpio_outen);
++
++u32 ssb_gpio_control(struct ssb_bus *bus, u32 mask, u32 value)
++{
++	unsigned long flags;
++	u32 res = 0;
++
++	spin_lock_irqsave(&bus->gpio_lock, flags);
++	if (ssb_chipco_available(&bus->chipco))
++		res = ssb_chipco_gpio_control(&bus->chipco, mask, value);
++	spin_unlock_irqrestore(&bus->gpio_lock, flags);
++
++	return res;
++}
++EXPORT_SYMBOL(ssb_gpio_control);
++
++u32 ssb_gpio_intmask(struct ssb_bus *bus, u32 mask, u32 value)
++{
++	unsigned long flags;
++	u32 res = 0;
++
++	spin_lock_irqsave(&bus->gpio_lock, flags);
++	if (ssb_chipco_available(&bus->chipco))
++		res = ssb_chipco_gpio_intmask(&bus->chipco, mask, value);
++	else if (ssb_extif_available(&bus->extif))
++		res = ssb_extif_gpio_intmask(&bus->extif, mask, value);
++	else
++		SSB_WARN_ON(1);
++	spin_unlock_irqrestore(&bus->gpio_lock, flags);
++
++	return res;
++}
++EXPORT_SYMBOL(ssb_gpio_intmask);
++
++u32 ssb_gpio_polarity(struct ssb_bus *bus, u32 mask, u32 value)
++{
++	unsigned long flags;
++	u32 res = 0;
++
++	spin_lock_irqsave(&bus->gpio_lock, flags);
++	if (ssb_chipco_available(&bus->chipco))
++		res = ssb_chipco_gpio_polarity(&bus->chipco, mask, value);
++	else if (ssb_extif_available(&bus->extif))
++		res = ssb_extif_gpio_polarity(&bus->extif, mask, value);
++	else
++		SSB_WARN_ON(1);
++	spin_unlock_irqrestore(&bus->gpio_lock, flags);
++
++	return res;
++}
++EXPORT_SYMBOL(ssb_gpio_polarity);
+Index: linux-2.6.23.16/include/linux/ssb/ssb.h
+===================================================================
+--- linux-2.6.23.16.orig/include/linux/ssb/ssb.h	2008-02-19 15:50:42.000000000 +0100
++++ linux-2.6.23.16/include/linux/ssb/ssb.h	2008-02-19 15:50:44.000000000 +0100
+@@ -283,6 +283,11 @@ struct ssb_bus {
+ 	/* Contents of the SPROM. */
+ 	struct ssb_sprom sprom;
+ 
++#ifdef CONFIG_SSB_EMBEDDED
++	/* Lock for GPIO register access. */
++	spinlock_t gpio_lock;
++#endif /* EMBEDDED */
++
+ 	/* Internal-only stuff follows. Do not touch. */
+ 	struct list_head list;
+ #ifdef CONFIG_SSB_DEBUG
+Index: linux-2.6.23.16/include/linux/ssb/ssb_embedded.h
+===================================================================
+--- linux-2.6.23.16.orig/include/linux/ssb/ssb_embedded.h	2008-02-19 15:50:42.000000000 +0100
++++ linux-2.6.23.16/include/linux/ssb/ssb_embedded.h	2008-02-19 15:50:44.000000000 +0100
+@@ -7,4 +7,12 @@
+ 
+ extern int ssb_watchdog_timer_set(struct ssb_bus *bus, u32 ticks);
+ 
++/* Generic GPIO API */
++u32 ssb_gpio_in(struct ssb_bus *bus, u32 mask);
++u32 ssb_gpio_out(struct ssb_bus *bus, u32 mask, u32 value);
++u32 ssb_gpio_outen(struct ssb_bus *bus, u32 mask, u32 value);
++u32 ssb_gpio_control(struct ssb_bus *bus, u32 mask, u32 value);
++u32 ssb_gpio_intmask(struct ssb_bus *bus, u32 mask, u32 value);
++u32 ssb_gpio_polarity(struct ssb_bus *bus, u32 mask, u32 value);
++
+ #endif /* LINUX_SSB_EMBEDDED_H_ */
+Index: linux-2.6.23.16/drivers/ssb/main.c
+===================================================================
+--- linux-2.6.23.16.orig/drivers/ssb/main.c	2008-02-19 15:50:42.000000000 +0100
++++ linux-2.6.23.16/drivers/ssb/main.c	2008-02-19 15:50:44.000000000 +0100
+@@ -571,6 +571,9 @@ static int ssb_bus_register(struct ssb_b
+ 
+ 	spin_lock_init(&bus->bar_lock);
+ 	INIT_LIST_HEAD(&bus->list);
++#ifdef CONFIG_SSB_EMBEDDED
++	spin_lock_init(&bus->gpio_lock);
++#endif
+ 
+ 	/* Powerup the bus */
+ 	err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);